<!DOCTYPE html>
<html lang="">

<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <script src="animate.js"></script>
    <style>
        * {
            margin: 0;
            padding: 0
        }

        ul {
            list-style: none;
        }

        body {
            background-color: black;
        }

        .c-nav {
            width: 900px;
            height: 42px;
            background: #fff url(images/rss.png) no-repeat right center;
            margin: 100px auto;
            border-radius: 5px;
            position: relative;
        }

        .c-nav ul {
            position: absolute;
        }

        .c-nav li {
            float: left;
            width: 83px;
            text-align: center;
            line-height: 42px;
        }

        .c-nav li a {
            color: #333;
            text-decoration: none;
            display: inline-block;
            height: 42px;
        }

        .c-nav li a:hover {
            color: white;
        }

        .cloud {
            position: absolute;
            left: 0;
            top: 0;
            width: 83px;
            height: 42px;
            background: url(images/cloud.gif) no-repeat;
        }
    </style>
</head>

<body>
<div class="c-nav" id="c_nav">
    <span class="cloud"></span>
    <ul>
        <li><a href="#">首页新闻</a></li>
        <li><a href="#">师资力量</a></li>
        <li><a href="#">活动策划</a></li>
        <li><a href="#">企业文化</a></li>
        <li><a href="#">招聘信息</a></li>
        <li><a href="#">公司简介</a></li>
        <li><a href="#">我是佩奇</a></li>
        <li><a href="#">啥是佩奇</a></li>
    </ul>
</div>

<script>
    // 1.获取元素
    var cloud = document.querySelector('.cloud');
    var cNav = document.querySelector('.c-nav');
    var lis = document.querySelectorAll('.c-nav li');

    // 2.给所有的小li绑定事件
    // 这个current 作为筋斗云的起始位置
    let current = 0;
    for (let i = 0; i < lis.length; i++) {
        // (1)鼠标经过把当前小li的位置作为目标值
        lis[i].addEventListener('mouseenter', function () {
            animate(cloud, this.offsetLeft)
        })
        // (2)鼠标离开就回到起始的位置
        lis[i].addEventListener('mouseleave', function () {
            animate(cloud, current)
        })
        // (3) 当我们鼠标点击, 就把当前位置作为目标值
        lis[i].addEventListener('click', function () {
            current = this.offsetLeft
        })
    }
</script>
</body>


</html>
